Protection Engineering Basics and Schemes Protection Engineering | Page 159

Method:
 1 st isolate the Relay need to be Test
 Off that circuit breaker ,on which Under Test Relay is
mounted
 Off the miniature circuit breaker of panel to dead the
relay supply (optional), I said it optional because
sometimes engineers energize relays from panel
supply.
 Always check either your panel is arc protected or
not , if not then make safe distance from relay panel
always be at 45° with panel , and remain at least 3 to
4 ft. radially away from panel during current injection
 Now make connection as per below circuit drawing,
you must have relay circuit drawing with you to
identify phase contacts and DC supply contacts
 After 0 Ampere position at Relay, either you can
check it by clamp meter if relay is not energized
(Electromechanical relay have this option only to
assessed for 0Ampere status), or you can check it via
front panel if relay is energized via AC/DC supply of
panel.
 Remove Test block cover , test plugs are provided but
you can insert Test leads directly in female contacts
of test block
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